CN108476188A

CN108476188A - The method and apparatus for being sent in Wave beam forming communication system or receiving reference signal

Info

Publication number: CN108476188A
Application number: CN201680063907.XA
Authority: CN
Inventors: 李贤龙
Original assignee: Samsung Electronics Co Ltd
Current assignee: Samsung Electronics Co Ltd
Priority date: 2015-11-02
Filing date: 2016-11-02
Publication date: 2018-08-31
Anticipated expiration: 2036-11-02
Also published as: EP3343859A1; CN108476188B; EP3343859B1; KR102602240B1; EP3343859A4; US10484152B2; WO2017078413A1; KR20180064543A; US20190058558A1

Abstract

This disclosure relates to the 5G or pre- 5G communication systems of the more high data rate for supporting to surmount 4G communication systems (such as LTE).Disclose a kind of method and apparatus for being sent in Wave beam forming communication system or receiving reference signal.This approach includes the following steps：Generate the reference signal sequence for the reference signal that can be used in beam search；Reference signal sequence is mapped to the modulation symbol corresponding to the resource element with scheduled identical subcarrier spacing in the resource element that can be used in sending reference signal；Generation includes the OFDM symbol signal of modulation symbol；OFDM symbol signal is sent at least one scheduled transmission wave beam in the transmission wave beam that can be used by base station is used.

Description

The method and apparatus for being sent in Wave beam forming communication system or receiving reference signal

Technical field

This disclosure relates to be used for for being formed in communication system to send and receive in extremely high frequency (millimeter wave) analog beam The method and apparatus for supporting the reference signal of effective beam search.

Background technology

In order to meet from forth generation (4th Generation, 4G) communication system be commercialized since increased no line number According to business demand, make efforts to develop improved 5G communication systems or pre- 5G communication systems.Therefore, 5G communication systems Or pre- 5G communication systems are referred to as super 4G network communicating systems or rear LTE system.

In order to realize high data transmission rate, considering real with hyperfrequency (millimeter wave) frequency band (such as 60GHz frequency bands) Apply 5G communication systems.In 5G communication systems, such as Wave beam forming, extensive MIMO, full dimension MIMO (full dimensional MIMO, FD-MIMO), array antenna, analog beam are formed and the technology of extensive antenna technology is as alleviating in UHF band Propagation path loss and increase propagate transmission range means and be discussed.

In addition, 5G communication systems have developed the small cell of such as evolution, high grade small cell, cloud are wirelessly electrically accessed Network (cloud RAN), super-intensive network, device-to-device communication (device-to-device communication, D2D), nothing It line backhaul, mobile network, collaboration communication, coordinating multiple points (coordinated multi-points, CoMP) and receives dry The technology of elimination is disturbed to improve grid.

In addition, 5G systems, which also developed, such as mixes FSK and QAM modulation (FSK and QAM modulation, FQAM) It is modulated with the advanced encoder of sliding window supercomposed coding (sliding window superposition coding, SWSC) (advanced coding modulation, ACM) scheme, and such as filter bank multi-carrier (filter bank multi Carrier, FBMC), non-orthogonal multiple (non-orthogonal multiple access, NOMA) and Sparse Code multiple access The advanced access technology of (sparse code multiple access, SCMA).

Millimeter wave frequency band can support the quick increase of mobile service using the wideband frequency of several GHz.For supporting milli The standard criterion of metric wave frequency band is the IEEE 802.11ad of 60GHz frequency bands (for example, wireless gigabit alliance (wireless Gigabit alliance, WiGiG)) standard, and such as Samsung, Nokia, Ericsson, Docomo are public The company of department, Intel company, Qualcomm etc. developed such as 15Ghz for next-generation mobile 5G communication standards, The various frequency candidate groups of 28GHz, 38GHz, 44GHz, 70GHz.

Compared with existing frequency band, millimeter wave frequency band has big path attenuation.However, millimeter-wave frequency can by In fixed physical space the multiple array antennas of installation and according to the shortwave characteristic application Wave beam forming of electric wave (beamforming, BF) technology come obtain high antenna gain and wireless communication needed for link budget.

In Wave beam forming communication system, only in base station (base station, BS) (or it will be referred to as node B) and The communication stablized when applying optimum beam between terminal (for example, movement station (mobile station, MS)) is only possible.This Outside, in the case of change in the case of terminal moves in optimum beam, the change of fast track optimum beam is needed.Therefore, There is provided it is a kind of can Wave beam forming communication in quickly and correctly the technology of the optimum beam between search base station and terminal is It is very important.

Recently, the scheme that Information Mobile Service is provided using millimeter wave frequency band has been discussed.In this case, in order to provide The handoff technique of continuous and seamless service, multi-cell environment is required, selects serving BS for terminal, it is every to provide acquisition The scheme of the independent channel information of a base station is very important.

Therefore, it is necessary to a kind of for effectively obtaining cell and wave in the base station and terminal system that operate multiple analog beams The technology of the channel information of beam.

Invention content

Technical problem

Present disclose provides the method and apparatus for sending and receiving reference signal in a communications system.

Present disclose provides execute effective wave beam for being formed in wireless communication system in the analog beam of millimeter wave frequency band The method and apparatus of search.

Present disclose provides for effectively sending and receiving the reference for beam search in Wave beam forming communication system The method and apparatus of signal.

Present disclose provides for forming in communication system each wave beam for effectively obtaining multiple base stations in analog beam Channel information method and apparatus.

Present disclose provides the method and apparatus for making it possible to efficiently perform channel estimation to multiple cells.

Present disclose provides for being formed in communication in the base station that multiple cell is sent letter in the analog beam of millimeter wave frequency band The method and apparatus that orthogonality is kept in number.

Technical solution

In accordance with an embodiment of the present disclosure, a kind of side for sending reference signal in Wave beam forming communication system is provided Method.This method includes：Generate the reference signal sequence for the reference signal that can be used in beam search；Reference signal sequence is mapped To the resource corresponding to having the same, the scheduled subcarrier spacing in the resource element that can be used in sending reference signal The modulation symbol of element；Generation includes orthogonal frequency division multiplexing (the orthogonal frequency division of modulation symbol Multiplex, OFDM) mark signal, wherein OFDM symbol signal be configured such that identical sequence pattern in the time domain with The period of scheduled subsymbol duration repeats pre-determined number；And it uses in the transmission wave beam that can be used by base station At least one scheduled transmission wave beam sends OFDM symbol signal.

In accordance with an embodiment of the present disclosure, a kind of side for receiving reference signal in Wave beam forming communication system is provided Method.This method includes：Each preassigned subsymbol duration using multiple reception wave beams come be sequentially received including The OFDM symbol signal of reference signal executes Fast Fourier Transform to the signal of the subsymbol duration of OFDM symbol signal (fast fourier transform, FFT) is operated, wherein OFDM symbol signal is configured so that identical sequence pattern Pre-determined number is repeated with the period of scheduled subsymbol duration in the time domain；It is given birth to using the signal obtained by FFT operations At corresponding to multiple channel informations for receiving wave beam；With use channel information from receive wave beam in select preferred received wave Beam.

In accordance with an embodiment of the present disclosure, provide it is a kind of in Wave beam forming communication system send reference signal base station in Device.The device includes：Base band transmitters are configurable to generate the reference signal for the reference signal that can be used in beam search Reference signal sequence is mapped to identical corresponding to having in the resource element that can be used in sending reference signal by sequence , the modulation symbol of the resource element of predetermined subcarrier spacing, and it includes that the OFDM symbol of modulation symbol is believed to generate Number, wherein OFDM symbol signal is configured such that identical sequence pattern in the time domain with the scheduled subsymbol duration Period repeats pre-determined number；And radio frequency (Radio Frequency, RF) transmission unit, being configured with can be by base station At least one scheduled transmission wave beam in transmission wave beam for using sends OFDM symbol signal.

In accordance with an embodiment of the present disclosure, provide it is a kind of in Wave beam forming communication system receive reference signal terminal in Device.The device includes：RF receiving units are configured as connecing using multiple in each preassigned subsymbol duration Wave beam is received to be sequentially received the OFDM symbol signal including reference signal, wherein OFDM symbol signal is configured such that phase Same sequence pattern repeats pre-determined number with the period of scheduled subsymbol duration in the time domain；And baseband receiver, quilt It is configured to execute Fast Fourier Transform (FFT) (FFT) operation to the signal of the subsymbol duration of OFDM symbol signal, using logical The signal that FFT operations obtain is crossed to generate corresponding to multiple channel informations for receiving wave beam, and uses channel information from received wave Shu Dangzhong selections are preferred to receive wave beam.

Description of the drawings

From the detailed description below in conjunction with attached drawing, above and other aspects, features and advantages of the disclosure will be more clear Chu, wherein：

Fig. 1 shows the comparison of millimeter wave frequency band and existing frequency band；

Fig. 2 shows the resource structures of the CSI-RS for extracting downlink channel information in LTE cellular systems；

Fig. 3 shows according to an embodiment of the present disclosure how small using analog beam formation technology in millimeter wave frequency band The example of the communication system of area's environment；

Fig. 4 shows the configuration for the normal OFDM symbol that can be applied to embodiment of the disclosure.

Fig. 5 shows the configuration according to an embodiment of the present disclosure for carrying the OFDM symbol of reference signal；

Fig. 6 is used to describe the example of the resource impact of reference signal according to an embodiment of the present disclosure；

Fig. 7 shows the transmitter architecture of the base station according to an embodiment of the present disclosure for sending reference signal；

Fig. 8 shows the receiver architecture of the terminal according to an embodiment of the present disclosure for receiving reference signal.

Fig. 9 is the flow chart for the operation for showing the base station according to an embodiment of the present disclosure for sending reference signal；

Figure 10 is the flow chart for the operation for showing the terminal according to an embodiment of the present disclosure for receiving reference signal；

Figure 11 shows the CP (cyclic according to an embodiment of the present disclosure that can be obtained from the signal of repeat pattern Prelix, cyclic prefix)；

Figure 12 shows that the OFDM symbol according to an embodiment of the present disclosure including reference signal exists with general purpose O FDM symbols Comparison on frequency domain；

Figure 13 is used to describe the received wave in the OFDM symbol signal according to an embodiment of the present disclosure including reference signal Beam conversion plan；

Figure 14 for describe it is according to an embodiment of the present disclosure using the part of CP duration come increase wave beam measure Quantity scheme；

Figure 15 schematically shows showing for the special subframe according to an embodiment of the present disclosure that can be used for beam search Example；

Figure 16 shows the resource agllutination in the special subframe according to an embodiment of the present disclosure that can be used for beam search Structure；

Figure 17 shows in the subframe according to an embodiment of the present disclosure that can be used for beam search include control channel Resource block structure；

Figure 18 is for describing the wave beam in the special subframe according to an embodiment of the present disclosure that can be used for beam search The figure of scanning；

Figure 19 is the transmission for describing the base station according to an embodiment of the present disclosure for searching for the period using adaptive beam Wave beam sends the figure of scene；

Figure 20 is the figure that the period is searched for for describing the adaptive beam of terminal according to an embodiment of the present disclosure；

Figure 21 shows the sequence diagram that the wave beam of terminal according to an embodiment of the present disclosure measures；

Figure 22 shows that analog beam according to an embodiment of the present disclosure forms the example of the multi-cell environment of system；

Figure 23 is the transmission beam scanning for describing the base station in multi-cell environment according to an embodiment of the present disclosure Figure；

Figure 24 is the reception beam scanning for describing the terminal in multi-cell environment according to an embodiment of the present disclosure Figure；

Figure 25 is believed for describing the reference according to an embodiment of the present disclosure using the beam search for base station synchronization Number operation figure；And

Figure 26 is the figure of the measurement for describing the frequency shift (FS) according to an embodiment of the present disclosure using repeating signal.

It should be understood that running through the figures above, similar reference numeral is for illustrating same or analogous element, feature and knot Structure.

Specific implementation mode

Hereinafter, the various embodiments of the disclosure will be described in detail with reference to the attached drawings.

In describing embodiment, it will omit to being not directly relevant to connection known in disclosure fields and with the disclosure The description of technical detail.Omitting unnecessary description intention prevents the main thought of the disclosure from becoming not knowing and be intended to more clearly Transmit main thought to Chu.

For the same reason, in the accompanying drawings, some elements may be exaggerated, omitted or schematically illustrated.In addition, every The size of a element not fully reflects actual size.In the accompanying drawings, identical or corresponding element is provided identical attached drawing mark Note.

By reference to the embodiment being described in detail below in conjunction with attached drawing, the advantages of the disclosure and feature and theirs are realized Mode will be apparent.However, the claimed range of the disclosure is not limited to embodiments set forth below, but can be with each Different forms is planted to implement.The present embodiment is provided just for the sake of completing to describe, and just for the sake of fully informing this The protection domain of disclosed embodiment those skilled in the art and the disclosure is only defined solely by the appended claims.It passes through Specification is worn, same or analogous reference numeral indicates same or analogous element.

Here, it will be appreciated that the combination of the block in each block and flowchart illustration of flowchart illustration can pass through calculating Machine program instruction is implemented.These computer program instructions can be provided to all-purpose computer, special purpose computer or other The processor of programmable data processing unit is to generate machine so that via computer or other programmable datas processing dress The instruction for the processor operation set creates the device of the function for being specified in implementing procedure segment or multiple flow chart blocks (means).These computer program instructions are also stored in during computer is available or computer-readable memory, the calculating Machine is available or computer-readable memory can instruct computer or other programmable data processing units to operate in a specific way, Enable be stored in computer be used or computer-readable memory in instruction generation include implementing procedure segment or multiple flows The product of the command device for the function of being specified in segment.Computer program instructions can also be loaded into computer or other are programmable So that executing series of operation steps on the computer or other programmable apparatus on data processing equipment, to generate computer The process of implementation so that the instruction that runs on the computer or other programmable apparatus is provided for implementing in flow chart block or more The step of function of being specified in a flow chart block.

And each block of flowchart illustration can indicate to include one for implementing specified (multiple) logic function Or it is multiple can the module, section of operating instruction or the part of code.It is also to be noted that in some alternative embodiments, stream The function of being mentioned in journey segment can occur out of order.For example, depending on involved function, the two block realities continuously shown It can substantially simultaneously be run on border or block can be run in reverse order sometimes.

Here, use in embodiment of the disclosure term "Unit " means such as field programmable gate array (field-programmable gate array, FPGA) or application-specific integrated circuit (application specific Integrated circuit, ASIC) software or hardware component, and "Unit " executes any function.However, " unit " Or " module " not always has the meaning for being limited to software or hardware." unit " or " module " can be constructed as being stored in addressable In storage medium or operation one or more processors.Therefore, " unit " or " module " include, such as software element, towards right Software element, class component or task components, process, function, attribute, program, subroutine, code segment, the driving journey of elephant Sequence, firmware, microcode, circuit, data, database, data structure, table, array and parameter.It is provided by " unit " or " module " Element and function can be combined into the element, " unit " or " module " of more smallest number, or be divided into greater amount of element, " unit " or " module ".Moreover, element and " unit " or " module " may be implemented as in reproduction equipment or secure multimedia card One or more CPU.

In the detailed description of embodiment of the disclosure, the channel radio based on orthogonal frequency division multiplexing (OFDM) will mainly be described Letter system.The theme of this specification can be applied to other communication systems with similar technical background and service, without departing from Range disclosed in this specification, and those skilled in the art can determine its application.

Fig. 1 shows the comparison of millimeter wave frequency band and existing frequency band.

With reference to figure 1, the frequency band 102 that is used in existing communication system usually in 700Mhz to 6GHz in the range of, and Peak value transmission rate (peak rate) is limited to 1Gbps.Meanwhile millimeter wave frequency band 104 include such as 15Ghz, 28GHz, The group of frequencies of 38GHz, 44GHz and 70GHz, and can support peak value transmission rate.

Fig. 2 shows the resource structures of the CSI-RS for extracting downlink channel information in LTE cellular systems.

With reference to figure 2, a resource block (resource block, RB) 200 can be by multiple subcarriers (for example, on frequency domain 12 subcarriers) and multiple symbols (for example, 14 symbols in time domain) composition, and include by subcarrier and symbol logo Multiple resource elements (resource element, RE).One RB 200 can be used for carrying the physical down in each RE Link control channel (physical downlink control channel, PDCCH) 202, physical down link sharing channel (physical downlink shared channel, PDSCH) 204, demodulated reference signal (demodulation Reference signal, DMRS) 206, cell specific reference signal (cell-specific reference signal, CRS) 208 or channel state information reference signals (channel state information reference signal, CSI-RS)210。

LTE specification distributes the CRS or CSI-RS for measuring channel status on the specific RE of all RB.LTE communication is false If the antenna of fixed solution is sent, therefore terminal can obtain the information about channel from CRS and CSI-RS.

In LTE specification, the RE for CRS and CSI-RS is dispersedly distributed as far as possible in the RB 200 of given structure, And remaining RE is allocated for PDCCH and PDSCH for sending control information and data.Therefore, it can be accorded at one The transmission of PDCCH/PDSCH and the transmission of CRS/CSI-RS are performed simultaneously during number.

It is formed in communication in analog beam, base station and terminal can use (multiple) array antenna to be formed with different waves Multiple (simulation) wave beams of Shu Fangxiang, and measure and send wave beam and the channel shape of the possibility beam combination (wave beam to) that receives wave beam State, to select optimum beam (combination).If PDCCH/PDSCH is sent and CRS/CSI-RS sends and is in the identical duration (for example, symbol), then terminal can letter only executed to CRS/CSI-RS on identical beam direction being sent with PDCCH/PDSCH Road measures.This is why analog beam formation scheme can be during the identical duration only on a beam direction The reason of sending signal.Therefore, it is necessary to distribute the reference signal that can be used for channel measurement, that is, for send/receive beam combination Beam search.

In the embodiment being described below, the transmission that will can be used for the reference signal of beam search is controlled with for sending The transmission of the PDCCH/PDSCH signals of information and data processed detaches in the time domain, therefore is operating independently in base station and terminal Wave beam is possible.

Meanwhile terminal needs to receive complete OFDM symbol when sending reference signal in fixed RB structures for obtaining one The channel status of a beam combination.For being completed in a short time the terminal of beam search in the case of terminal high-speed moves, The OFDM symbol that quantity is equal to required beam combination quantity is assigned, and this leads to huge overhead.It is described below Embodiment provide a kind of reduction overhead and optimize the technology of beam search program.

Because millimeter wave frequency band uses wideband frequency, millimeter wave frequency band to have relatively short compared with existing frequency band Sample duration, therefore the absolute time of (CP) duration of the cyclic prefix in OFDM symbol shortens due to this reason. In multi-cell environment, if receiving the signal except the CP duration in the terminal, the orthogonality in signal is destroyed, Therefore it is difficult to normally handle signal for terminal.Due to this reason, compared with existing frequency band, to the complete of same levels The relative effect of ball positioning system (global positioning system, GPS) error and propagation delay differences becomes very Greatly.The embodiment being described below provides a kind of technology, which can keep ginseng in the base station in multi-cell environment Examine the orthogonality in signal.

It, cannot be abundant if not executing beam search correctly within given time under analog beam formational situation Obtain link budget, it is thus possible to which there is a situation where the not connected serious problems of the communication between such as base station and terminal.Therefore, The embodiment being described below provides a kind of technology, wherein can be on the millimeter wave frequency band formed using analog beam effectively And steadily execute beam search.

Fig. 3 shows according to an embodiment of the present disclosure how small using analog beam formation technology in millimeter wave frequency band The example of the communication system of area's environment.

With reference to figure 3, three adjacent base stations (for example, enhancement mode node B (enhanced Node B, eNodeB)) are shown 302,304 and 306, and each base station 302,304 and 306 can pass through the transmission wave beam of each base station 302,304 and 306 312,314 and 316 signal, the cell for covering each base station 302,304 and 306 for being classified as three sectors are sent.Eventually End 310 can by the reception wave beam 320 of terminal 310 from three base stations 302,304 and 306 receive by send wave beam 312, 314 and 316 signals sent.

The whole and terminal 310 of base station 302,304 and 306 can be formed using analog beam, and terminal 310 is from end It is searched for most in the combination for sending wave beam and the reception wave beam of terminal 310 of all adjacent base stations 302,304 and 306 at end 310 Good beam combination is used for smooth communication.In order to support to search for, each base station 302,304 and 306 passes through each base station 302,304 With 306 all transmission wave beams 312,314 and 316 come send can be used for downlink channel measurement reference signal, and Terminal 310 uses reference signal selection optimum reception wave beam, and will be anti-corresponding to the selected channel information for receiving wave beam It is fed to corresponding base station B 302,304 and 306.Here, channel information may include, such as wave beam ID (beam ID, BID), letter It road quality information (channel quality information, CQI), order designator (rank indicator, RI) and prelists At least one of code Matrix Indicator (precoding matrix indicator, PMI).

In the various embodiments of the disclosure, can be used for the reference signal of beam search will be referred to as beam reference signal (beam reference signal, BRS) or wave beam refine reference signal (beam refinement reference Signal, BR-RS).

Fig. 4 shows the configuration for the normal OFDM symbol that can be applied to embodiment of the disclosure.Here, in order to describe this Disclosed various embodiments, will define subcarrier spacing is 75kHz (15kHz × 5), and will be to the OFDM symbol duration The analog beam of 13.3 microseconds (micro second, us) forms communication system and is assumed.

With reference to figure 4, the time-domain signal 404 of OFDM symbol 402 occupies the time span of 13.3us and includes 2048 samples This.The frequency-region signal 406 of OFDM symbol 402 occupies the frequency band of 150MHz and includes 2048 subcarriers.Each subcarrier Interval is 75kHz.

Only when terminal receives all samples of time-domain signal 404, terminal just may switch to frequency-region signal 406 to obtain Obtain channel information.Therefore, the composition of sample shown can be used for the channel information for only obtaining a beam direction.

In the embodiment being described below, reference signal can be configured so that identical pattern accords with for one in the time domain Pre-determined number R is repeated during number duration, is consequently for effective beam search.

Fig. 5 shows the configuration according to an embodiment of the present disclosure for carrying the OFDM symbol of reference signal.

With reference to figure 5, the sample for constituting the time-domain signal 504 for the OFDM symbol 502 for including reference signal is divided into R sample Group 504a, 504b, 504c and 504d, and each sample group constitutes subsymbol 506a, 506b, 506c and 506d.Shown here as The example of the case where R=4.Four sample groups 504a, 504b, 504c and 504d have the phase being made of the sample of 512 3us Same sequence pattern, therefore the identical sequence pattern is repeated four times in the time domain.The CP 504e of OFDM symbol 502 are present in Before four sample groups 504a, 504b, 504c and 504d.

As embodiment, OFDM symbol 502 can be generated by the way that identical sequence is repeated R times in the time domain.

As embodiment, OFDM symbol 502 can be by arranging that the reference at the interval with R subcarrier is believed on frequency domain Number sequence and N point FFT are executed to generate.In the illustrated example, N=2048.The frequency-region signal 506 of OFDM symbol 502 by Four subsymbol 506a, 506b, 506c and 506d compositions, and it is each in four subsymbols 506a, 506b, 506c and 506d It is a to be made of 512 sub- carrier waves of the subcarrier spacing with 300kHz.CP is added to generated by FFT including reference In the OFDM symbol signal of signal, and the OFDM symbol signal for being added to CP is sent by the transmission wave beam of base station.For example, OFDM symbol signal can be sent by all transmission wave beams or at least one transmission wave beam of base station.

Using R=4 repetition, reference signal sequence maps on frequency domain in embodiment of the disclosure To modulation symbol can be defined as equation (1).

[equation 1]

In accordance with an embodiment of the present disclosure, reference signal sequence can be defined as to following equation (2).

[equation 2]

Wherein, k and l indicates the index on the index and time domain on frequency domain, p and n respectively_sRespectively indicate antenna end slogan and Timeslot number,WithIndicate the quantity of cell ID and downlink resource blocks (RB),It is m-th of reference signal sequence Row, andIndicate the modulation symbol carried by k-th of subcarrier.As embodiment, base station can be used than general Frequency-region signal in OFDM symbol four times greater transmission power sends the frequency-region signal including reference signal sequence.

During the symbol duration (i.e. 13.3 us) distributed for BRS/BRRS, terminal connects switch endpoint The reference signal sent from base station is received while receiving wave beam, and by repeating R N/R-FFT to received signal To obtain the frequency response signal of four subsymbols 506a, 506b, 506c and 506d.In the illustrated example, correspond to terminal The signal of the OFDM symbol received during 13.3us is made of 2048 samples, and terminal can be with every 512 samples Execute four times 512 point FFT.

In detail, first 3.3us after CP of the terminal in the symbol duration distributed for BRS/BRRS is held Signal is received using the first reception wave beam during the continuous time (the subsymbol duration hereinafter, will be referred to as), second Signal is received using the second reception wave beam during the duration of a 3.3us, is made during the duration of third 3.3us Wave beam is received with third to receive signal, and receives wave beam using the 4th during the duration of the last one 3.3us Receive signal.Hereafter, 512 point FFT are executed to the received signal of the first subsymbol duration, and exports the first received wave The channel information of beam.Next, executing 512 point FFT to the received signal of the second subsymbol duration, and export second Receive the channel information of wave beam；512 point FFT are executed to the received signal of third subsymbol duration, and export third Receive the channel information of wave beam；And 512 point FFT are executed to the received signal of the last one subsymbol duration, and Export the last one channel information for receiving wave beam.Each channel information is used to assess the corresponding channel quality for receiving wave beam.

Terminal can be received for assessing necessary to necessary reception wave beam (for example, all reception wave beams of terminal) OFDM symbol is assessed the channel quality of the reception wave beam of terminal, and is used for and Current Serving BTS based on channel quality selection Communication preferred reception wave beam.

When the hardware of terminal is implemented, can use for receiving other signals (for example, controlling signal or data-signal) 2048 fft circuits execute four 512-FFT processes for receiving reference signal.That is, terminal can pass through It repeats to come with 512 points of corresponding sub-blocks four times of 2048 fft circuits when receiving the OFDM symbol including reference signal Operation.Like this, during OFDM symbol duration (that is, 13.3us), terminal can obtain to be detached in the time domain The individual channel information of four subsymbols and four subsymbols.

Fig. 6 is used to describe the example of the resource impact of reference signal according to an embodiment of the present disclosure.Here, use is shown The resource element 602 of reference signal is sent in each OFDM symbol on each antenna port.

With reference to figure 6, it can be used for the reference signal sequence of wave beam refinement in all OFDM symbols or by associated In the downlink subframe of down link control information (downlink control information, DCI) instruction at least One or the interior transmission of at least two OFDM symbols.It is defined according to the OFDM symbol number in the timeslot number and time slot in radio frame Constitute the reference signal sequence of reference signal.Reference signal sequence can be mapped to corresponding to each the R resource element 602 Modulation symbol.Accordingly, reference signal has the signal mode repeated with R individual sub-carriers interval on frequency domain.

As embodiment, can by the control information of base station to terminal notification include the subframe of reference signal, time slot and/ Or symbol.As embodiment, base station can send the letter of instruction specific duration (for example, subframe, time slot and/or symbol) Breath, can be believed by the information by radio resource control (radio resource control, RRC), PDCCH and system At least one of block (system information block, SIB) is ceased to send reference signal.

Fig. 7 shows the transmitter architecture of the base station according to an embodiment of the present disclosure for sending reference signal.

With reference to figure 7, base band transmitters 702 include sequence generator 404, resource mapper 706, fast fourier inverse transformation (inverse fast fourier transform, IFFT) 708 and CP adders 710, and it is connected to RF transmission units 712。

Sequence generator 404 generates reference signal according to the OFDM symbol number in the timeslot number and time slot in radio frame Sequence.Reference signal sequence can be mapped to by resource mapper 706 according to predefined repeat count (such as R=4) to be corresponded to The modulation symbol of resource element with four subcarrier spacings.IFFT 708 includes adjusting to what is inputted by resource mapper 706 The signal of symbol processed executes IFFT, and CP is added to the output of IFFT 708 to generate OFDM symbol letter by CP adders 710 Number.OFDM symbol signal can be input into RF transmission units 712 by digital analog converter (not shown).RF transmission units 712 Including at least one transmission array antenna, and pass through all transmission wave beams of base station or at least one preassigned send wave Beam sends input signal.

With reference to figure 8, RF receiving units 802 include at least one receiving array antenna, and are including being specified for During the OFDM symbol duration in the downlink subframe of reference signal for wave beam refinement, each preassigned While conversion receives wave beam during the subsymbol duration (for example, 512 sample durations), from base station received signal. Received signal is sent to baseband receiver 804 by analog-digital converter (not shown).

Baseband receiver 804 includes CP removers 806, FFT 808 and channel estimator 810.

CP removers 806 remove CP duration, and the letter that will eliminate the CP duration from the signal received Number it is input to FFT 808.FFT 808 can be inputted by 512 specified input points from 2048 input points in total Signal from CP removers 806.FFT 808 executes four sub- symbol durations of an OFDM symbol signal four times FFT is operated, to receive the different reference signals for receiving wave beam.The reception corresponding with each FFT operations of 810 pairs of channel estimator Signal execute channel estimation, to generate each channel information for receiving wave beam.Channel information be input into controller (or control Processor) (not shown), and can be used for assessing and receive wave beam and select preferably to receive wave beam.

Fig. 9 is the flow chart for the operation for showing the base station according to an embodiment of the present disclosure for sending reference signal.

With reference to figure 9, base station is (or given by top signaling that base station is sent according to base station cell ID in operation 905 Value), the OFDM symbol number in timeslot number and time slot in radio frame generate reference signal sequence, operating 910 bases Reference signal sequence is mapped to the resource element with four subcarrier spacings by predefined repeat count (for example, R=4), IFFT is executed in 915 pairs of reference signal sequences through mapping of operation, and CP is added to the letter generated by IFFT in operation 920 Number to generate OFDM symbol signal.Base station passes through all transmission wave beams of base station or at least one preassigned in operation 925 Wave beam is sent to send OFDM symbol signal.

Figure 10 is the flow chart for the operation for showing the terminal according to an embodiment of the present disclosure for receiving reference signal.

With reference to figure 10, in operation 1005, terminal is held for the OFDM symbol in the specified downlink subframe of wave beam refinement During the continuous time, wave beam is received in each preassigned subsymbol duration (for example, 512 sample durations) conversion While, from base station received signal.Terminal removes the CP duration in operation 1010 from received signal, and is operating The signal of four sub- symbol durations of 1015 pairs of signals for therefrom removing CP executes four FFT operations.1020 are being operated, Terminal-pair executes channel estimation by the received signal that four FFT are obtained, to generate each channel information for receiving wave beam.Letter Road information, which can be used for assessing, to be received wave beam and selects preferred reception wave beam.

Figure 11 shows the CP according to an embodiment of the present disclosure that can be obtained from the signal of repeat pattern.

With reference to figure 11, base station repeats on four sub- symbol durations in the time-domain signal 1104 of OFDM symbol 1102 Send identical pattern 1104a, 1104b, 1104c and 1104d tetra- times.In the first duration of OFDM symbol 1102, hair Send CP 1104e.Reference numeral 1106 and 1108 indicates the reference signal of the terminal received in the time domain and is received on frequency domain The reference signal of the terminal arrived.

Even if terminal-pair randomly selected 512 samples (that is, subsymbol) from 2048 samples of OFDM symbol 1102 Execute FFT (that is, FFT#1 1108a, FFT#2 1108b and FFT#3 1108c), the signal being close in before each subsymbol 1106a, 1106b and 1106c serve as CP, therefore can entirely prevent the intersymbol interference caused by channel latency tap The generation of (Inter-Symbol Interference, ISI).Terminal can by by each FFT 1108a, 1108b and The signal execution of phase correction that 1108c is obtained compensates the phase difference of the symbol of each subsymbol.

Therefore, terminal can also execute simple channel equalization as in existing OFDM receiver to 512 signals, Therefore ofdm system, which has the advantage that, maintains as former state.No matter when each subsymbol of reference signal is received, and terminal is not It needs to obtain the additional CP duration, it is very effective to be configured as possibility in the one side of specification.

Accordingly, terminal can will be used to be transformed into frequency domain on time-domain signal 1106 according to random selection the case where terminal The FFT windows of signal 1108.Original repetitive pattern signal has in the time domain according to the position of the FFT windows determined by terminal The effect of cyclic shift, therefore this leads to the linear phase shift effect on frequency domain.Terminal is known that the repetition mould selected by terminal Cyclic shift is how many in the time domain according to the positions of FFT windows for formula signal, therefore terminal can calculate the line on frequency domain Property phase shift simultaneously obtains original channel information by compensating the linear phase shift.

Figure 12 shows general in OFDM symbol and frequency domain according to an embodiment of the present disclosure including reference signal The comparison of OFDM symbol.

With reference to figure 12, in the general purpose O FDM symbols 1202 not including reference signal, a subcarrier has 75kHz bandwidth (that is, subcarrier duration) 1202a, however, in the OFDM symbol 1204 including reference signal, a subcarrier has 300kHz bandwidth 1204a.Finally, including a subcarrier of the OFDM symbol of reference signal 1204 corresponds to OFDM symbol 1202 Four subcarriers, therefore for a subcarrier obtain channel information can be considered as typical value, it is right which passes through The channel information of four subcarriers at same position in OFDM symbol 1204 including reference signal is averaged and is obtained.

It, can be by repeating identical pattern in the time domain in embodiment above disclosured, rather than drop The precision of frequency domain in the low identical duration, to provide the terminal with multiple chances of beam search.

Figure 13 is used to describe the received wave in the OFDM symbol signal according to an embodiment of the present disclosure including reference signal Beam conversion plan.

With reference to figure 13, base station repeats on four sub- symbol durations in the time-domain signal 1304 of OFDM symbol 1302 Send identical pattern 1304a, 1304b, 1304c and 1304d tetra- times.In the first duration of OFDM symbol 1302, hair Send CP 1304e.Base station can send repeat pattern 1304a, 1304b, 1304c and 1304d using identical transmission wave beam. Reference numeral 1306 and 1308 indicates the reference signal of terminal received in the time domain and the terminal received on frequency domain Reference signal.

Correspond to multiple cell of the terminal after the CP duration corresponding to the CP 1304e of OFDM symbol 1302 is propagated After the duration 1312a of difference, wave beam #1 1310a are received using MS to receive first group of 512 sample 1308a.It is receiving After wave beam converts 1312b, wave beam #2 1310b are received using MS to receive second group of 512 sample 1308b.Receiving wave beam After converting 1312c, wave beam #3 1310c are received using MS to receive 512 sample 1308c of third group.Each group of 512 samples This 1308a, 1308b and 1308c pass through 512 point FFT.

As described above, in the signal duration of repeat pattern, base station executes transmission while fixed transmission wave beam, Terminal executes reception while scanning receives wave beam, therefore executes beam search.Terminal receive wave beam conversion 1312b and Change the physical configuration of such as gain of wave beam weight and RF units during 1312c, therefore, because due to change physical configuration and The noise of generation, the signal during receiving wave beam conversion 1312b and 1312c may be not used in FFT.According to the receiver of terminal Chip characteristics obtain the time span received needed for wave beam conversion 1312b and 1312c.

FFT windows can be located in the random of the OFDM symbol duration including reference signal by terminal as described above At position, therefore terminal waits for the beam conversion time received needed for wave beam conversion and navigates to FFT windows next 512 samples.The channel letter of three reception wave beams can be measured by being configured as the terminal operated as the embodiment in Figure 13 Breath.As another embodiment, if beam conversion time can be ignored, terminal can execute four measurements.

As described above, in embodiment of the disclosure, passing through the hair for receiving wave beam rather than converting base station of switch endpoint Send wave beam, in the identical time more wave beam measurements be possible to.If base station executes while conversion sends wave beam Beam scanning, then base station need to wait for time enough, the time correspond to channel propagation delay whenever Switched-beam and Delay extension so that other than beam conversion time, sending the additional interference in wave beam in time will not occur.So And if sending that wave beam is fixed while the reception wave beam of switch endpoint in base station, terminal can wait for wave beam to turn Beam search is executed while changing the time, when which is happened at conversion reception wave beam, without considering due to each Send the interference effect of the channel propagation delay and delay extension of wave beam.In general, compared with channel propagation delay and delay extension, Beam conversion time is very short, therefore interior at the same time can measure more wave beams by conversion reception wave beam.

Figure 14 for describe it is according to an embodiment of the present disclosure using the part of CP duration come increase wave beam measure Quantity scheme.

With reference to figure 14, base station repeats on four sub- symbol durations in the time-domain signal 1404 of OFDM symbol 1402 Send model identical 1404a, 1404b, 1404c and 1404d tetra- times.In the first duration of OFDM symbol 1402, send CP 1404e.Base station can use identical transmission wave beam to send repeat pattern 1404a, 1404b, 1404c and 1404d.Attached drawing Label 1406 and 1408 indicates the reference of the reference signal and the terminal received on frequency domain of the terminal received in the time domain Signal.

Terminal is received after the duration 1412a corresponding to the channel delay spread of OFDM symbol 1402 using MS Wave beam #1 1410a receive first group of 512 sample 1408a.After receiving wave beam conversion 1412b, MS received waves are used Beam #2 1410b receive second group of 512 sample 1408b.After receiving wave beam conversion 1412c, wave beam #3 is received using MS 1410c receives 512 sample 1408c of third group.After receiving wave beam conversion 1412d, wave beam #4 1410d are received using MS Receive the 4th group of 512 sample 1408d.Every group of 512 samples 1408a, 1408b, 1408c and 1408d pass through 512 point FFT.

Channel delay spread can be predicted by channel measurement.It is pre- if it is present channel according to the embodiment shown The channel delay spread of survey is short enough, that is to say, that if the channel delay spread predicted is less than predetermined reference value, terminal The sample that can be wasted by inputting some samples after CP duration 1404e and being converted to FFT due to wave beam to compensate, and And execute the search for being directed to total of four wave beam.As embodiment, if three beam conversion times from CP shorter than by continuing Time subtracts the time that the channel delay spread of prediction generates, then when terminal can be determined using corresponding to lasting from OFDM symbol Between sample (some samples for including the CP duration) after the sample of channel delay spread that starts execute four wave beams It measures.

Figure 15 schematically shows showing for the special subframe according to an embodiment of the present disclosure that can be used for beam search Example.Here, reference signal is repeatedly disposed in the structure without the CP duration, for making the wave beam in special subframe Search efficiency maximizes.

With reference to figure 15, a frame 1502 has the length of 2ms, and may include 10 subframes.One subframe 1504 has By 200us length and can be made of two time slots.One time slot 1506 has the length of 100us, and may include 30 subsymbols without the CP duration.One subsymbol 1508 has the length of 3.33us, and may include 512 samples This.The length of each sample 1510 is 6.5ns.Constituting the special son for being designated the reference signal including can be used for beam search In 60 subsymbols of frame without the CP duration in the case of repeat 512 samples.

The special subframe 1504 shown does not have the expense of CP, therefore can allow maximum in a sub-frame duration The beam search of quantity.Special subframe 1504 does not have the structure with 12 subcarriers and CP as other subframes, therefore Special subframe 1504 does not have consistency with other subframes, and can not possibly be sent under such as physics by special subframe 1504 The control information of Uplink Control Channel (PDCCH) or physical uplink control channel (PUCCH).

Figure 16 shows the resource agllutination in the special subframe according to an embodiment of the present disclosure that can be used for beam search Structure.

With reference to figure 16, it is designated as including that the special subframe 1600 of the reference signal that can be used for beam search wraps on frequency domain Three subcarriers 1610 are included, and include 60 subsymbols of not CP in the time domain.The reference signal being made of 512 samples Sequence pattern 1620 repeat in the special subframe 1600 to send 60 times.

As embodiment, base station will send wave beam during special subframe 1600 and fix, and terminal can be in special son Reference signal is received by N number of wave beam while executing reception beam scanning 1605 during frame 1600.

As embodiment, base station is converted during special subframe 1600 and the transmission wave beam of application predetermined quantity.For example, base It stands to convert with every 3 to 30 subsymbols and sends wave beam.Similarly, terminal can execute reception during special subframe 1600 Reference signal is received by N number of wave beam while beam scanning.At this point, conversion send wave beam duration in, when Some time sequence allowances are needed on domain, therefore when base station converts and sends wave beam, it may occur however that some expenses.

Figure 17 shows in the subframe according to an embodiment of the present disclosure that can be used for beam search include control channel Resource block structure.

With reference to figure 17, subframe 1700 is made of 14 OFDM symbols including CP, to keep existing structure.In subframe During the first two symbol in 1700, PDCCH 1720 and DL (dowlink, downlink) DMRS 1722 can be sent.It is connecing During ten symbols 1715 to get off, for example, each symbol duration sends ten times by four sub- set of symbols as shown in Figure 5 At reference signal, therefore 40 reference signals are sent in total.For protection interval (guard interval, GI) 1726 A symbol after last symbol can be used for send PUCCH 1728 and UL (uplink, uplink) DMRS 1730.According to situation, thus it is possible to vary the subframe structure, the increase of the quantity of such as reference signal, the quantity of reference signal subtract It is few etc..

Similar to Figure 16, base station can will send wave beam during the duration for the reference signal for sending subframe 1700 and consolidate Fixed or execution sends beam scanning.Terminal can connect during the duration for the reference signal for sending subframe 1700 in execution Reference signal is received by N number of wave beam while receiving beam scanning 1705.Like this, subframe 1700 have with including CP's The similar overall structure of the general subframes of 14- symbolic constructions, and can have in internal useful symbol duration 1715 Four repeat patterns.If necessary to the transmission of PDCCH or PUCCH, then the subframe structure shown can be used for carrying with reference to letter Number.It can be assigned to send the quantity of the symbol of the symbol duration 1715 of reference signal and/or position be predetermined , or can be configured from the top signaling of base station with origin.

Figure 18 is for describing the wave beam in the special subframe according to an embodiment of the present disclosure that can be used for beam search The figure of scanning.

With reference to figure 18, base station sends wave beams 1825 using up to 16 transmission wave beams 1815, terminal using up to 32, and And a special subframe 1820 for reference signal is specified in a frame 1810.During special subframe 1820, terminal can To search for all reception wave beams 1825.In order to search for the beam combination with all transmission wave beams 1815 of base station completely (for example, wave Beam to), terminal needs to receive reference signal by 16 frames, with obtain 16 × 32 beam combinations channel information.Therefore, Terminal searching all periods sent needed for wave beam are arranged to 16 frames 1805, and terminal can be completed during the period To the beam search of all beam combinations.

In the case where terminal high-speed is mobile or user rotates terminal, search wave beam takes longer time, therefore Enough beam search may not be executed during the period.Therefore, if there are multiple transmission antennas, base station to need for base station It is suitably designed and sends wave beam transmission scene, for reducing the beam search time of terminal.

In general, compared with the distance between base station and terminal, the distance in the mutiple antennas of base station is very close, different The signal that adjacent antennas is sent to identical transmission beam direction is received at terminal with almost the same signal strength.Single defeated In the case of entering single output (single input single output, SISO), the signal-to-noise ratio based on received signal (signal-to-noise ratio, SNR) sends the selection of wave beam to execute, and terminal simply chooses with most intensity Send the direction of wave beam.This means that need not identify the transmission wave beam of each transmission antenna in the siso case.

In the case of multiple-input and multiple-output (multiple input multiple output, MIMO), in order to select most Good beam combination, terminal needs to measure channel capacity, for all hairs of each transmission antenna of base station in the channel capacity Wave beam is sent to consider phase.That is, although sending, beam direction is identical, and the channel capacity in transmission antenna is due to sending day Phase difference in line and there is difference, therefore terminal needs fully to search for all transmission wave beams of each transmission antenna.

Figure 19 is the transmission for describing the base station according to an embodiment of the present disclosure for searching for the period using adaptive beam Wave beam sends the figure of scene.

With reference to figure 19, there are four transmission antennas for base station tool, and can use up to 16 transmission antennas.Terminal searching base The period needed for all transmission wave beams stood is 16 frames 1910, and 16 frames 1910 are illustrated as superframe 1905.Base station will surpass 16 frames in frame 1905 are divided into 4 frame groups corresponding with the quantity of the transmission antenna of base station, and configure and send wave beam sequence Row so that all 16 transmission wave beams are distributed in each frame group.

In detail, the transmission antenna #0 1915 of base station passes through on frame-basis during the first four frame of superframe 1905 Send wave beam #0, #1, #2 and #3 sequentially send include reference signal sequence signal；During next four frames, lead to Cross send wave beam #4, #5, #6, #7 sequentially send include reference signal sequence signal；During next four frames, lead to Cross send wave beam #8, #9, #10 and #11 sequentially send include reference signal sequence signal；And in last four frame phases Between, by send wave beam #12, #13, #14 and #15 sequentially send include reference signal sequence signal.

In detail, the transmission antenna #1 1920 of base station passes through on frame-basis during the first four frame of superframe 1905 Send wave beam #4, #5, #6 and #7 sequentially send include reference signal sequence signal；During next four frames, lead to Cross send wave beam #8, #9, #10, #11 sequentially send include reference signal sequence signal；During next four frames, By send wave beam #12, #13, #14 and #15 sequentially send include reference signal sequence signal；And in last four frames Period, by send wave beam #0, #1, #2 and #3 sequentially send include reference signal sequence signal.

Similarly, during each frame of superframe 1905, the transmission antenna #1 1925 and #21930 of base station by with transmission Antenna 1915 and 1920 different transmission wave beams send signal.

It is specified for sending 1935 period of subframe of reference signal, received wave of the terminal in switch endpoint in each frame From base station received signal while beam 1940.The wave beam of terminal according to the transmission wave beam sequence self-adapting of base station configurating terminal is searched The rope period, and can be during 16 frames by searching for all beam combinations for sending wave beam from base station received signal.

As embodiment, if terminal is with high-speed mobile, the variation of channel is very big, therefore suitable MIMO transmissions are difficult And it is usual only consider SISO send.In this case, the possibility that best beam combination is changed quickly is very high, therefore Terminal needs execute beam search according to the period as quickly as possible.In the case where only considering SISO, signal is only received Signal strength is important, and terminal need not receive the wave beam only sent by identical transmission antenna, and pass through even if measuring The channel information for the wave beam that different neighbouring transmission antennas are sent, it is also possible to obtain measurement result identical with identical transmission antenna.

Therefore, in the case where SISO is sent, terminal can execute in a frame group (as shown in (1) in Figure 19) Beam search and nonrecognition transmission antenna.One frame group includes all transmission wave beams, therefore terminal can be in the case of SISO Execute search completely.As a result, even if the beam search period is reduced to 1/4, stable communication is also possible on the move. In the disclosure, which will be defined as fast search modes.

As embodiment, if terminal is moved with low speed, it is contemplated that MIMO is sent.In the case where MIMO is sent, It includes the channel capacity of phase information and the signal strength of each wave beam to measure, and is important for terminal.Therefore, terminal It needs to obtain antenna diversity by considering transmission wave beam send by all transmission antennas, same beam direction, with most Bigization MIMO sends possibility.Therefore, in the case where MIMO is sent, terminal is by receiving all transmission antennas (in such as Figure 19 (2) shown in) the signals of all transmission wave beams execute beam search.In the disclosure, which will be defined as Full search pattern.

Figure 20 is the figure that the period is searched for for describing the adaptive beam of terminal according to an embodiment of the present disclosure.

With reference to figure 20, when executing SISO transmissions while high-speed mobile, terminal #0 2015 is determined with fast search mould Formula operates.During corresponding to the 8ms of four frames, the reception wave beam 2015a of using terminal #0 is received by coming terminal #0 2015 The signal sent from all transmission wave beams of the transmission antenna #0 2010 of base station 2005, #12015, #2 2020, #3 2025, and And based on the channel information of all transmissions of the signal measurement/reception beam combination received.

Terminal #1 2020 and terminal #2 2025 is determined when executing MISO while low speed moves and sending to search completely Rope pattern operates.Terminal #1 2020 and terminal #2 2025 is during corresponding to the 16ms of 16 frames, 2020 Hes of using terminal #1 Reception the wave beam #2020a and 2025a of terminal #2 2025, to receive through transmission antenna #0 2010, #1 from base station 2005 2015, #2 2020, #3 2025 all transmission wave beams and the signal that sends, and all hairs are measured based on the signal received Send/receive the channel information of beam combination.

Like this, the method that base station and terminal execute transmission on beam directions as different as possible wherein can add Ground obtains the effect for the dynamic range for reducing terminal receiver.This is why believing if transmission antenna is sent with the same direction Number, strong signal is cumulatively added and the deviation of signal strength is very big, however, if adjacent transmission antenna as above-described embodiment with The case where beam direction scattered as far as possible sends signal, then strong signal and weak signal are inputted together frequently occurs, and so The deviation of signal strength finally becomes smaller afterwards.

Figure 21 shows the sequence diagram that the wave beam of terminal according to an embodiment of the present disclosure measures.It retouches in the illustrated example It has stated and has been designated as including the case where there are 60 repeat patterns on the special subframe of reference signal.

With reference to figure 21, designated includes that the special subframe 2105 of reference signal is made of 60 sub- symbols, and base station exists Fixed transmission wave beam 2110 is used during 60 subsymbols.

First t of the terminal in special subframe 2105₀Wave beam measurement is not executed during time 2120.t₀Time 2120 is to be used for Overcome the GPS synchronization discrepancies and propagation delay differences in due to base station and the predetermined protection of time difference in the base station signal that occurs Interval.It, can be by t as embodiment₀Time 2120 is calculated as the sum of GPS offsets and cell propagation delay differences of base station.

Next t₁Time 2125 is that terminal is surveyed by executing FFT to the signal received to execute wave beam on frequency domain The wave beam of amount measures symbol duration.t₁Distribution and arrangement of the time 2125 according to reference signal sequence can have for example just Such as the length of 1/4 512 samples of 2048 samples of OFDM symbol.Next t₂Time 2130 be actually receive when not It can be used as the part that terminal executes the beam conversion time for receiving wave beam conversion.As embodiment, t₂Time 2130 can be counted Calculate the sum of beam conversion time and the time sequence allowance to be determined according to the characteristic of the RF units of terminal.Later, terminal passes through continuous Repeat t₁Duration 2125 and t₂Duration 2130 continuously performs wave beam measurement.

The last one t₃Time 2135 is scheduled protection interval, if the letter for preventing from being firstly received adjacent base station Number and occur interference problem.It, can be by t as embodiment₃Time 2135 be calculated as base station GPS offset and switching threshold it is inclined The sum of move.

Table 1 shows that terminal according to an embodiment of the present disclosure executes the example that wave beam measures required parameter.

Table 1

Figure 22 shows that analog beam according to an embodiment of the present disclosure forms the example of the multi-cell environment of system.

With reference to figure 22, each base station 2202,2204 and 2206 can pass through the transmission of each base station 2202,2204 and 2206 Wave beam 2212,2214 and 2216 sends signal, in multi-cell environment covering be classified as each bases of three sectors Stand 2202,2204 and 2206 cell.Terminal 210 can receive the transmission wave beam by three base stations 2202,2204 and 2206 2212,2214 and 2216 signal sent.As shown in figure 22, if terminal 2210 is by multiple base stations 2202,2204 and 2206 shadows It rings, then terminal 2210 needs the Modulation recognition by base station 2202,2204 and 2206 to execute beam search.

The case where when each base station scans send wave beam, each base station discontinuously uses identical transmission wave beam twice Under, while the base station that terminal measures sends wave beam using one, occur to send wave beam conversion in other base stations, because Orthogonality in the signal of this base station is destroyed.The efficiency that wave beam measures as a result, may reduce by 1/2.

Figure 23 is the transmission beam scanning for describing the base station in multi-cell environment according to an embodiment of the present disclosure Figure.

With reference to figure 23, serving cell 2305 is the sector #0 that terminal is intended to the base station #0 measured, and neighboring community 2315 is base Stand #1 sector #1 and neighboring community 2325 be base station #2 sector #2.Each cell 2305,2315 and 2325 can be every During the special subframe 2310,2320,2330 of a cell 2305,2315 and 2325, in the transmission wave beam for sending each subsymbol While send reference signal.There are propagation delay differences 2315a and 2325a in the signal of cell 2305,2315 and 2325, Therefore the reference signal sent from cell 2305,2315 and 2325 poorly arrives at terminal 2340 with the time.Although terminal 2340 Wave beam 2345 will be received and fix and receive reference signal, the channel information for each beam combination that terminal 2340 measures may also have Error.

Figure 24 is the reception beam scanning for describing the terminal in multi-cell environment according to an embodiment of the present disclosure Figure.

With reference to figure 24, serving cell 2405 is the sector #0 that terminal is intended to the base station #0 measured, and neighboring community 2415 is base Stand #1 sector #1 and neighboring community 2425 be base station #2 sector #2.Each cell 2405,2415 and 2425 can be every During the special subframe 2410,2420,2430 of a cell 2405,2415 and 2425, sent by a fixed transmission wave beam Reference signal.There are propagation delay differences 2415a and 2425a in the signal of cell 2405,2415 and 2425, therefore from cell 2405,2415 and 2425 reference signals sent poorly arrive at terminal 2440 with the time.Terminal 2440 is in special subframe 2410 The first t₀Wave beam measurement is not executed during time 2440a, and in t₀After time 2440a wave beam 2445 is received in conversion Reference signal is received based on subsymbol simultaneously.Channel measurement based on reference signal, terminal 2440 can be obtained for every The fixed channel information for sending wave beam and the beam combination of the reception wave beam of terminal 2440 of a cell 2405,2415 and 2425. t₀Time 2440a can be determined so that t₀Time 2440a is at least more than the channel delay spread measured in advance and corresponds to phase The sum of time sequence allowance of reaching time-difference in adjacent base station.Time sequence allowance can pass through the signal of adjacent base station in measuring terminals Reaching time-difference obtain.

As described above, in multi-cell environment, terminal is held while the transmission wave beam of base station is fixed in a subframe Row receives beam scanning, therefore wave beam measurement can be performed quickly in terminal while simply waiting for minimum beam conversion time, Such as single-cell environment.

As embodiment, the orthogonality in signal in order to obtain base station simultaneously makes minimum interference, and base station can use Different frequency bands executes the transmission using frequency division multiplexing (frequency division multiplex, FDM) scheme, or Using the reference signal being made of orthogonal code (Zadoff-Chu (ZC) sequence, prime sequence etc.), such as on frequency domain The base station signal not overlapped.

Although being directed to downlink describes embodiment, method similarly can be used for uplink drive test Amount.

Figure 25 is believed for describing the reference according to an embodiment of the present disclosure using the beam search for base station synchronization Number operation figure.

With reference to figure 25, base station is being designated to include four in the time-domain signal 2504 of the OFDM symbol 2502 of reference signal During the subsymbol duration, repeat to send model identical 2504a, 2504b, 2504c and 2504d tetra- times.In OFDM symbol In 2502 the first duration, CP 2504e are sent.Reference numeral 2506 and 2508 indicates the terminal received in the time domain Reference signal and the terminal received on frequency domain reference signal.If necessary, terminal, which can use, is used for wave beam The reference signal (that is, BRS/BRRS) of search is come and base station synchronization.

It receives wave beam if terminal is not converted during the duration of OFDM symbol 2502 and is connect using a fixation Wave beam 2510 (on reception beam direction as best as possible) is received to receive signal, then the terminal can continuously be obtained by base The signal for the model identical sent of standing up to four times.

Terminal can use the phase difference in obtained signal to measure due to the oscillator between base station and terminal Carrier frequency shift caused by (Oscillator, OSC) deviation (Carrier Frequency Offset, CFO) or sampling frequency Rate deviates (Sampling Frequency Offset, SFO).That is, terminal can be from the phase difference estimation of total frequency band CFO, and the phase slope of service band estimates SFO.

With reference to figure 26, terminal can calculate the signal 2605 obtained from the first FFT and the signal 2610 obtained from the 2nd FFT Between phase difference 2615, and based on phase difference 2615 calculate CFO and SFO.

Terminal can determine that terminal is execution beam search using reference signal or executes synchronization.

The embodiment for the reference signal that base station is provided the terminal with for beam search is described above, however, identical Method can be applied to terminal to base station provide reference signal the case where.

Embodiment as described above provides the scheme for generating reference signal and effectively operates the scheme of wave beam, makes Effective beam search can be carried out in analog beam formation system.By embodiment as described above, if base station is with more Antenna, then terminal can adaptively operate the beam search duration, and can receive ginseng using fixed reception wave beam Signal is examined, to use reference signal to be used as synchronous with base station.

The particular aspects of the disclosure may be implemented as the computer-readable code in computer readable recording medium storing program for performing.It calculates Machine readable medium recording program performing is the scheduled data storage device that can store the data that can be read by computer system.Computer The example of readable medium recording program performing may include read-only memory (read-only memory, ROM), random access memory (random access memory, RAM), CD-ROM, tape, floppy disk, optical data storage devices and carrier wave are (such as by because of spy The data of net are sent).Computer readable recording medium storing program for performing can be distributed by being connected to the computer system of network, and therefore Computer-readable code can be stored and be run in a distributed way.Also, functional programs used to implement the present disclosure, generation Code and code segment can be easily explained by the programmer of disclosure fields.

It will be understood that method and apparatus according to an embodiment of the present disclosure can be with hardware, software or hardware and software The form of combination implement.It is (all that any such software can be stored in such as volatibility or non-volatile memory device Such as ROM), memory (such as RAM, memory chip, memory devices or memory IC) or recordable be optically or magnetically situated between In matter (such as CD, DVD, disk or tape), the ability being wiped free of but regardless of it or the ability being newly recorded.It is appreciated that Method according to various embodiments of the present disclosure can by including controller and memory computer or portable terminal Lai real Existing, wherein memory is suitable for the machine that storage includes one or more programs of the instruction for implementing embodiment of the disclosure One example of device readable storage medium storing program for executing.

Therefore, the disclosure includes the generation for implementing the device and method described in the appended claims of this specification The program of code and machine (computer etc.) readable storage medium storing program for executing for storing said program.Also, the program can be by such as It carries to any media electronic of the signal of communication transmitted by wired or wireless connection, and the disclosure uitably includes its etc. Jljl.

Moreover, device according to an embodiment of the present disclosure can from it is wired or be wirelessly connected to the device program provide Equipment receives program, and can store the program.Program provides equipment：Program including instruction, is referred to by this Data processing apparatus is enabled to execute preset content guard method；Memory, for the information etc. needed for storage content guard method；It is logical Unit is believed, for executing and the wired or wireless communication of data processing apparatus；And controller, it is set for being handled according to program Corresponding program is automatically sent to transceiver by standby request.

Meanwhile disclosed embodiment of the disclosure is only presented with and is easily described the disclosure in the specification and illustrated in the drawings It technology contents and helps to understand the disclosure, and is not intended to limit the scope of the present disclosure.In addition, above disclosured real It applies example to be merely illustrative, and it will be understood by those skilled in the art that various modifications are equivalent with it within the scope of this disclosure What object was possible to.Therefore, the real technical scope of the protection of the disclosure should be limited by claims appended below.

Claims

1. a kind of method for sending reference signal in Wave beam forming communication system, including：

Generate the reference signal sequence for the reference signal that can be used in beam search；

The reference signal sequence is mapped to correspond in the resource element that can be used in sending the reference signal and is had There is the modulation symbol of the resource element at same sub-carrier interval, wherein the subcarrier spacing is scheduled on frequency domain；

Generation includes orthogonal frequency division multiplexing (OFDM) mark signal of the modulation symbol, wherein the OFDM symbol signal quilt It is arranged so that identical sequence pattern and pre-determined number is repeated with the period of scheduled subsymbol duration in the time domain；And

Believed to send OFDM symbol using at least one scheduled transmission wave beam in the transmission wave beam that can be used by base station Number.

2. the method for claim 1, wherein sending and including：It is solid by one during the scheduled beam search period Surely wave beam is sent to send the OFDM symbol signal.

3. the method for claim 1, wherein using at least one in the cell ID of base station, subframe index and timeslot number It is a to generate the reference signal sequence.

4. the method as described in claim 1 further includes：

The direction of resource location and transmission wave beam of the instruction for sending reference signal is sent by controlling information or top signaling At least one of configuration information.

5. the method for claim 1, wherein sending and including：Different transmission wave beams is used by multiple transmission antennas Send the OFDM symbol signal, and

Wherein each transmission antenna is configured as sequentially sending out using all transmission wave beams during the scheduled beam search period Send the OFDM symbol signal.

6. the method for claim 1, wherein sending and including：Use the frequency band different from other adjacent base stations or orthogonal Code sends the OFDM symbol signal.

7. the method as described in claim 1, wherein the reference signal sequence is defined as following equation,

The reference signal sequence is mapped to modulation symbol according to following formula,

Wherein, k and l indicates the index on the index and time domain on frequency domain, p and n respectively_sAntenna end slogan and time slot are indicated respectively Number,WithIndicate the quantity of cell ID and downlink resource blocks (RB),It is m-th of reference signal sequence, and AndIndicate the modulation symbol carried by k-th of subcarrier.

8. a kind of method for receiving reference signal in Wave beam forming communication system, including：

It is sequentially received including reference signal using multiple reception wave beams in each preassigned subsymbol duration OFDM symbol signal, wherein the OFDM symbol signal is configured so that identical sequence pattern in the time domain with scheduled The period of subsymbol duration repeats pre-determined number；

Fast Fourier Transform (FFT) (FFT) is executed to the signal of the subsymbol duration of the OFDM symbol signal to operate；

It is generated corresponding to the multiple channel information for receiving wave beam using the signal obtained by FFT operations；And

Using the channel information, from receiving, selection in wave beam is preferred to receive wave beam.

9. method as claimed in claim 8, wherein sending the OFDM symbol using a fixed transmission wave beam of base station Signal.

10. method as claimed in claim 8, further includes：

By controlling information or top signaling resource location and transmission wave beam of the instruction for sending reference signal are received from base station At least one of direction configuration information.

11. method as claimed in claim 8, wherein reception includes：

The signal for receiving the first subsymbol duration that wave beam receives in OFDM symbol signal using first, first son Symbol duration is in the time domain in scheduled cyclic prefix (CP) duration or corresponding to the channel latency measured in advance Start after the duration of extension；With

The signal that wave beam received for the second subsymbol duration is received using second, the second subsymbol duration at least exists After beam conversion time since the first subsymbol duration.

12. method as claimed in claim 11, wherein it includes continuing to being included in each subsymbol to execute the FFT operations Sample in the signal of time executes FFT, and the signal execution of phase correction to being obtained by the FFT operations.

13. method as claimed in claim 11, wherein the first subsymbol duration is confirmed as according with from the OFDM More than the channel delay spread measured in advance in number signal and the sequential corresponding to the reaching time-difference in adjacent base station The sum of amount starts.

14. method as claimed in claim 8, wherein beam search Time segments division is the hair corresponding to the base station by base station Multiple frame groups of the quantity of antennas, and by the transmission antenna in each frame group by all transmission wave beams of the base station come The OFDM symbol signal is sent,

Wherein, if terminal is operated with single-input single-output (SISO) pattern, one in multiple frame groups of the terminal The OFDM symbol signal is received during frame group to execute high speed unicast beam search, and

Wherein, if the terminal is operated with multiple-input and multiple-output (MIMO) pattern, the terminal is in the multiple frame group phase Between receive the OFDM symbol signal, to execute overall beam search to the multiple transmission wave beam.

15. method as claimed in claim 8, further includes：

The OFDM symbol signal is received using a fixed reception wave beam；With

It is executed using the OFDM symbol signal synchronous with base station, wherein received using a fixed reception wave beam described OFDM symbol signal.

16. the device in a kind of base station sending reference signal in Wave beam forming communication system, including：

Base band transmitters are configured as：The reference signal sequence for generating the reference signal that can be used in beam search, by the ginseng Examine signal sequence be mapped to corresponding to can be used in send reference signal resource element in it is having the same, on frequency domain The modulation symbol of the resource element for the subcarrier spacing being determined in advance, and generation includes the orthogonal frequency of the modulation symbol It is multiplexed (OFDM) mark signal, wherein the OFDM symbol signal is configured so that identical sequence pattern in the time domain with pre- The period of fixed subsymbol duration repeats pre-determined number；With

Radio frequency (RF) transmission unit is configured at least one scheduled in the transmission wave beam that can be used by base station Wave beam is sent to send the OFDM symbol signal.

17. the device in a kind of terminal receiving reference signal in Wave beam forming communication system, including：

RF receiving units are configured as coming sequentially using multiple reception wave beams in each preassigned subsymbol duration Reception includes the OFDM symbol signal of reference signal, wherein the OFDM symbol signal is configured so that identical sequence mould Formula repeats pre-determined number with the period of scheduled subsymbol duration in the time domain；With

Baseband receiver is configured as：The signal of the subsymbol duration of the OFDM symbol signal is executed in quick Fu Leaf transformation (FFT) operates, and is generated using the signal obtained by FFT operations and corresponds to the multiple channel for receiving wave beam Information, and select preferably to receive wave beam in the reception wave beam using the channel information.